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1
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Interface, Guided and Non-Localized Modes in Superlattices

100%
Brazis R., Narkowicz R., Safonova L.
Acta Physica Polonica A
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1995
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vol. 87
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issue 2
333-336
EN
The numerical dispersion calculations in long-period GaAs/AlAs super-lattice were performed using a local theory with retardation as well as an ef­fective medium approximation. The splitting of the dispersion branches near the transverse optical phonon frequencies and phonon-like to photon-like modes transition were found to depend on the superlattice spatial period. The characteristic frequencies of bulk modes and crossing point of disper­sion branches estimated analytically with the use of an effective medium approximation were found to agree with the results of rigorous solution.
2
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In-Plane Propagating Coupled Photon-Phonon-Magnetoplasmons, their Field Structure and Dispersion in GaAs/AlAs Superlattices

100%
Brazis R., Narkowicz R., Safonova L.
Acta Physica Polonica A
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1995
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vol. 88
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issue 4
687-690
EN
The dispersion and field structure of in-plane propagating p-polarized waves in n-GaAs/AlAs superlattice is studied in the frequency range below 10 THz in the presence of the steady magnetic field which is perpendicu­lar both to the direction of propagation and periodicity. The existence of non-localized photon-phonon-plasmon modes as well as the magnetic-field­-controlled mode localization at selected set of interfaces is predicted.
3
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Transmission and Reflection of Millimeter Waves in i-GaAs/n-GaAs Periodic Structures in Voigt Configuration

100%
Narkowicz R., Brazis R., Safonova L.
Acta Physica Polonica A
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1997
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vol. 92
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issue 5
929-934
EN
The paper presents the first experimental results on the in-plane propagation of millimeter waves in GaAs ...n-i-n-i-... type periodic layered structures in the Voigt geometry. The data are found to agree with theoretical calculations based on the effective medium approximation, showing the feasibility of contactless non-destructive probing of periodic layered structures.
4
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Optical Properties of Cd_{1-x}Mn_xTe Crystals near Fundamental Absorption Edge in Transverse Magnetic Fields

100%
Safonova L., Brazis R., Narkowicz R.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
267-270
EN
A simple and convenient model is proposed to elucidate the optical characteristics of Cd_{1-x}Mn_xTe crystals using experimental data on light reflection in magnetic field. The model is based on the quasi-oscillator concept accounting both for the exciton and fundamental absorption edge contributions. The energy dependencies of refraction index and absorption coefficient are presented for Mn mole fraction x=20% at the magnetic field values up to 5 T.
5
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Third-Order Susceptibility of Silicon Crystals Measured with Millimeter-Wave Gyrotron

76%
Narkowicz R., Siegrist M., Moreau P., Hogge J., Raguotis R., Brazis R.
Acta Physica Polonica A
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2011
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vol. 119
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issue 4
509-513
EN
We investigate experimental dependence of the third harmonic generation efficiency in the n-type Si crystals on the geometrical dimensions of the sample, polarization and power of the fundamental wave. The efficiency increases monotonically with the rise of the sample thickness up to a threshold value, and decreases dramatically above the threshold. At shorter propagation distances the generation efficiency could be correctly simulated using the layered medium approximation and the numerically calculated electron drift velocity response to the pumping wave electric field to describe the change of the semiconductor properties under high-power microwave irradiation.
6
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Exciton Properties in CdTe/CdMnTe Quantum Well Structures with Strong Localization Effects

76%
Godlewski M., Narkowicz R., Wojtowicz T., Karczewski G., Kossut J., Bergman J., Monemar B.
Acta Physica Polonica A
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1998
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vol. 94
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issue 2
317-320
EN
Strong localization effects present in quantum well structures of CdTe/ CdMnTe noticeably affect exciton dynamics and strength and character of exciton-phonon interaction. We show that the temperature dependences of the PL linewidth, PL peak wavelength and PL decay time strongly deviate from those expected for Wannier-excitons in structures with atomically smooth interfaces.
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